# Calculating work from E-Field Graphs

## Homework Statement

a)Calculate the work performed by an external agent to move a charge of -0.39x10^-12 C from i' to b'

Hint: The equipotential lines shown are separated by 1 kV. Work to move a charge is the increase in potential energy of the charge. The potential energy is the potential times the charge.

b)Calculate the magnitude of the electric field at `k'.

a)-q*ΔV = Work
b) E = -ΔV/Δd

## The Attempt at a Solution

a)I have tried simply plugging in the values:
q = (-0.39x10^-12) and ΔV = ([3 - +3]*1000)

And got the answer 2.34*10^-9 J

b)not really sure where to start here...